Stability of ferromagnetism in FCCFe-Cu-Au alloys prepared by mechanical alloying

Citation
H. Ino et al., Stability of ferromagnetism in FCCFe-Cu-Au alloys prepared by mechanical alloying, MAT SCI E A, 312(1-2), 2001, pp. 262-266
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
0921-5093 → ACNP
Volume
312
Issue
1-2
Year of publication
2001
Pages
262 - 266
Database
ISI
SICI code
0921-5093(20010815)312:1-2<262:SOFIFA>2.0.ZU;2-K
Abstract
We have studied the relation between the stability of ferromagnetism and th e atomic volume of FCC Fe-Cu-Au alloys prepared by mechanical alloying by m eans of X-ray diffraction, magnetization measurement and Mossbauer effect. The atomic volume of the FCC Fe0.5Cu0.5 alloy increased almost linearly wit h the substitution of Au atoms for Cu from original 12.09 x 10(-3) to 13.31 x 10(-3) nm(3) for 40% replacement. The Curie temperature of the alloy als o increased in the same manner from 489 to 582 K. It is found that the incr ease in atomic volume stabilizes the ferromagnetic state of the FCC alloys. The values of magnetic moment of iron in Fe0.5Cu0.4Au0.1 and Fe0.5Cu0.3Au0 .2 were estimated to be 2.34 and 2.44 muB, respectively, which are larger t han that of alpha -iron (2.22 muB). The magnetic hyperfine field of iron in Fe0.5Cu0.4Au0.1 showed wide distribution from 22 to 38 T at 82 K, which is probably caused by the variation of species of surrounding atoms of iron. (C) 2001 Elsevier Science B.V. All rights reserved.